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When you're actually running Calibre, a little. But it's hardly a significant amount. With ~600 books in Calibre, it uses 85 Mb of RAM at startup. Not sure what the difference would be to load 1200 books, but not much, certainly.
Having books in Calibre will use hard disk space, which is not the same as memory, but even there it's a trivial amount compared to the available space.
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